Features: This is a great electric motor gearbox used for children's cars. The middle gear is made of metal which is more sturdy and durable. It will make quite low noise and more wear-resistant. There are many types for different voltage and speed that you can choose as need. It will be a great replacement part for your broken or old ones. Specifications: Type(Optional): 6V12000RPM, 12V23000RPM, 12V18000RPM, 12V8000RPM, 6V10000RPM, 6V8000RPM, 12V20000RPM, 6V15000RPM Hole Inner Diameter: 1.2cm/0.5in Quantity: 1 Weight: 483g~515g(approx.) Package Includes: 1 x Electric Motor Gearbox Package List 1This is a great electric motor gearbox used for children's cars 2The middle gear is made of metal which is more sturdy and durable 3It will make quite low noise and more wear-resistant 4There are many types for different voltage and speed that you can choose as need 5It will be a great replacement part for your broken or old ones